Grumpy does not dissuade Ryoji. If anything it tends to encourage him.

"It's nice to meet you, Hajime! What are you doing? Is that a camera?" It is pretty obviously a camera, but Ryoji would like to know what he thinks he's trying to take pictures of. Some of the 'nonsense' people hear about paranormal investigating can be real, after all, even if this guy probably isn't a Sin-Eater. ...He's probably something, though, his life span looks really long.